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【单选题】
专供牵引机车停留，等待连挂列车的线路称（）。（A、2、X）[05-00-01-02][010101]
A.
安全线
B.
避难线
C.
机待线
D.
牵出线
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers